20741087 has 4 divisors (see below), whose sum is σ = 20759400. Its totient is φ = 20722776.

The previous prime is 20741069. The next prime is 20741107. The reversal of 20741087 is 78014702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78014702 = 2 ⋅39007351.

It is a cyclic number.

It is not a de Polignac number, because 20741087 - 2¹⁰ = 20740063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7337 + ... + 9762.

It is an arithmetic number, because the mean of its divisors is an integer number (5189850).

Almost surely, 2^20741087 is an apocalyptic number.

20741087 is a deficient number, since it is larger than the sum of its proper divisors (18313).

20741087 is a wasteful number, since it uses less digits than its factorization.

20741087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18312.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20741087 is about 4554.2383556419. The cubic root of 20741087 is about 274.7538822762.

Adding to 20741087 its reverse (78014702), we get a palindrome (98755789).

The spelling of 20741087 in words is "twenty million, seven hundred forty-one thousand, eighty-seven".